Quarter	US dollars
1999-09-30	362
1999-12-31	295
2000-03-31	440
2000-06-30	475
2000-09-30	615
2000-12-31	668
2001-03-31	840
2001-06-30	677
2001-09-30	1167
2001-12-31	1853
2002-03-31	1052
2002-06-30	1167
2002-09-30	1039
2002-12-31	1527
2003-03-31	1728
2003-06-30	2076
2003-09-30	2256
2003-12-31	2559
2004-03-31	2288
2004-06-30	1545
2004-09-30	1440
2004-12-31	1993
2005-03-31	1819
2005-06-30	2151
2005-09-30	4671
2005-12-31	5090
2006-03-31	4095
2006-06-30	5406
2006-09-30	4747
2006-12-31	4022
2007-03-31	3874
2007-06-30	4964
2007-09-30	6662
2007-12-31	8668
2008-03-31	13316
2008-06-30	11873
2008-09-30	10226
2008-12-31	16771
2009-03-31	14778
2009-06-30	13362
2009-09-30	12628
2009-12-31	11050
2010-03-31	13257
2010-06-30	12082
2010-09-30	13650
2010-12-31	13687
2011-03-31	10397
2011-06-30	10886
2011-09-30	13973
2011-12-31	12945
2012-03-31	14237
2012-06-30	12561
2012-09-30	12104
2012-12-31	11009
2013-03-31	10237
2013-06-30	9335
2013-09-30	9344
2013-12-31	9682
2014-03-31	9158
2014-06-30	9261
2014-09-30	9332
2014-12-31	10223
2015-03-31	11990
2015-06-30	9886
2015-09-30	10877
2015-12-31	10599
2016-03-31	10743
2016-06-30	10313
2016-09-30	9828
2016-12-31	8172
2017-03-31	7111
2017-06-30	6170
2017-09-30	5725
2017-12-31	5867
2018-03-31	5366
2018-06-30	3420
2018-09-30	4464
2018-12-31	4723
2019-03-31	5263
2019-06-30	6118
2019-09-30	13957
2019-12-31	11676
2020-03-31	23791
2020-06-30	24547
2020-09-30	23006
2020-12-31	15329
2021-03-31	10135
2021-06-30	8745
2021-09-30	7440
2021-12-31	6658
2022-03-31	5836
2022-06-30	8553
2022-09-30	11548
2022-12-31	9616
2023-03-31	7882
2023-06-30	11141
2023-09-30	10874